1 Department of Radiotherapy, Apollo Multispeciality Hospitals, Kolkata, India; Department of Physics, GLA University, Mathura, India. Electronic address: biplabphy@gmail.com.
2 Department of Radiotherapy, Manipal Hospitals, Dwarka, New Delhi, India.
3 Department of Medical Physics, Apollo Proton Cancer Center, Chennai, India.
4 Department of Mathematics, GLA University, Mathura, India.